Bentley 330100-50-00 Detailed Product Description

I. Product Overview

Bentley 330100-50-00 is a 8mm eddy current preamplifier (Proximitor Sensor) of the 3300 XL series from Bently Nevada under Baker Hughes, serving as the core signal conditioning unit of the rotating machinery condition monitoring and protection system. It is designed in accordance with API 670 standards. As a key component for non-contact measurement, it is integrated with an 8mm eddy current probe and the accompanying extension cable to form a complete measurement chain. It is used for real-time monitoring of shaft vibration, axial displacement, shaft eccentricity, and keyway signals in rotating machinery, widely applied in power, petrochemical, metallurgical and other industries for online monitoring, fault early warning and safety protection of key equipment such as steam turbines, gas turbines, compressors, generators, etc. The total cable length of this model system is calibrated at 5.0m, without special certification configuration, and is suitable for ordinary non-explosion-proof industrial areas. It is the basic preamplifier of the 330100 series.

II. Model Decoding

330100: Basic model, representing the 3300 XL series standard preamplifier, specifically adapted for the 8mm eddy current probe system;

50: The total cable length of the system (probe + extension cable) is 5.0 meters, suitable for medium to short distance wiring scenarios;

00: Configuration code, without certification or special function options, is the basic industrial-grade version, only applicable to general non-explosion-proof industrial environments.

III. Working Principle

It operates based on the eddy current measurement principle. The preamplifier's internal high-frequency oscillator generates a stable alternating current, which is transmitted through the connecting cable to the probe's internal coil. When the probe approaches the rotating metal shaft, the shaft surface induces eddy currents, which reverse and change the inductance and impedance values of the probe coil. The preamplifier accurately captures this impedance change, undergoes signal amplification, demodulation, and linearization processing, and outputs a linear negative voltage analog signal proportional to the gap (displacement) between the probe and the shaft, thereby achieving non-contact static gap (displacement) and dynamic vibration measurement. The measurement process is not affected by oil, water vapor, dust, etc., and can operate stably in harsh industrial environments for a long time.

IV. Core Technical Parameters

(1) Electrical Parameters

Adapter probes: 330101, 330102, 330103, 330104 series 8mm eddy current probes;

Sensitivity: 7.87 V/mm (200 mV/mil), high measurement accuracy;

Linear measurement range: 0.25mm - 2.3mm, effective range 2.0mm;

Output voltage: -1VDC to -17VDC; standard static installation gap of 1.27mm, output is -9VDC;

Frequency response: 0Hz - 10kHz (+0/-3dB), covering the vibration monitoring requirements of high and low-speed rotating equipment;

Power supply: -24VDC (±10%), input range -17.5VDC to -26VDC, maximum power consumption ≤ 2W;

Output impedance: 50Ω, compatible with standard industrial signal acquisition interfaces;

Power supply stability: for every 1V change in input voltage, the output voltage changes < 2mV, strong anti-power supply fluctuation interference capability.

(2) Environmental and Mechanical Parameters

Preamplifier operating temperature: -40℃ to +85℃;

Adapter probe operating temperature: -51℃ to +177℃, excellent high-temperature performance;

Storage temperature: -51℃ to +100℃;

Protection grade: IP67, dustproof and water-resistant, suitable for humid and dusty conditions;

Shell material: glass fiber reinforced polyamide, shock-resistant, corrosion-resistant, anti-electromagnetic interference;

Installation method: standard 35mm DIN rail installation, compatible with traditional panel installation (four-hole installation holes are consistent with the old model). Dimensions: Approximately 110mm × 70mm × 20mm;

Weight: Approximately 0.25kg. Compact structure, easy installation.

(III) Certification and Compliance

Basic Certification: CE certification, meeting electromagnetic compatibility (EMC) requirements;

No explosion-proof certification: Only applicable to ordinary non-flammable and non-explosive industrial areas, prohibited for use in dangerous explosion-proof scenarios;

Industry Standards: Compliant with API 670 rotating machinery monitoring standards, suitable for mainstream industrial monitoring scenarios.

V. Structural Design and Core Features

(1) Structural Design

Adopting a compact modular structure, it can be directly clamped onto the standard DIN rails in the control cabinet, or fixed through a four-hole panel installation. Installation is convenient for disassembly and assembly. The equipment is equipped with a dedicated gold-plated coaxial signal interface (for connecting the probe and extension cable), power connection terminals and signal output terminals. The port layout is clear, corrosion-resistant and connection stable. The system has been precisely calibrated at the factory for a total cable length of 5.0m, with high impedance matching, minimal signal loss over long distances, and no need for on-site secondary calibration. The installation base comes with electrical isolation function, eliminating the need for an additional isolation board, simplifying the installation process.

(2) Core Advantages

High precision and stability: Low drift design, built-in temperature compensation circuit, consistent measurement data over long-term operation, reducing drift errors;

Strong anti-interference ability: Built-in electromagnetic shielding structure, effectively resisting EMI/RFI interference generated by frequency converters and high-power motors, suitable for complex electromagnetic environments;

Short-distance compatibility: Exclusive 5.0m cable length calibration, meeting the requirements of close-distance wiring for small and medium-sized equipment, low signal transmission loss;

Full compatibility and interchangeability: Fully compatible with all 8mm probes and extension cables of the 3300 XL series. Components can be directly interchanged without additional matching calibration, reducing spare parts management costs;

Industrial-grade reliability: IP67 protection level, sturdy structural design, capable of long-term stable operation in high-temperature, dusty, and vibrating harsh conditions, extending equipment service life;

Non-contact measurement: No mechanical wear, avoiding the loss issues of contact sensors, reducing maintenance frequency and costs;

Flexible installation: Supports DIN rails and panel installation methods, suitable for different control cabinet layout requirements.

VI. System Composition and Compatibility

(1) Complete System Composition

A complete measurement system consists of the 330100-50-00 preamplifier, the 3300 XL 8mm probe (330101/02/03/04 series), and the 330130 series extension cable. The total cable length (probe + extension cable) must strictly be 5.0m; otherwise, it will affect measurement accuracy and is prohibited from being changed at will.

(2) Equipment Compatibility

Fully compatible with the 3300 and 3500 series monitoring racks, with output analog signals directly accessible;

Can be connected to mainstream industrial control systems such as DCS and PLC to achieve real-time display, over-limit alarm, and equipment safety interlock functions;

Compatible with AISI 4140 steel and other common metal shaft materials, no additional adaptation or adjustment required.

VII. Typical Application Scenarios

Power Industry: Steam turbines, gas turbines, generators, feedwater pumps, etc. of thermal power plants and nuclear power plants for main and auxiliary equipment vibration and displacement monitoring;

Petrochemical Industry: Centrifugal compressors, process pumps, fans, etc. for high-speed rotating machinery, suitable for non-explosion-proof production areas;

Metallurgical Industry: Large drive motors, blast furnace fans, gearboxes, etc. for high-speed rotating equipment for condition monitoring;

General Industry: Key rotating equipment in papermaking, cement, etc., for equipment fault early warning and preventive maintenance.

VIII. Installation and Maintenance Specifications

(1) Installation Requirements Installation location: Fixed on the DIN rail or panel inside the control cabinet, away from heat sources, high-voltage components and strong electromagnetic interference sources (such as frequency converters, transformers);

Wiring specification: Clearly distinguish power terminals, signal output terminals and probe interfaces. Secure the connections, tighten the coaxial connectors to avoid poor contact;

Gap adjustment: Adjust the static gap between the probe and the measured shaft to 1.27mm. Prohibit direct contact between the probe and the shaft to prevent damage to the probe;

Cable management: The total length should be strictly controlled at 5.0m. The cable bending radius should be no less than 5 times the cable diameter to avoid excessive bending and damage to the internal core wires.

(II) Daily maintenance

Regular calibration: Conduct a precision calibration once a year to ensure that the measurement performance meets the standards;

Routine inspection: Check the tightness of connectors, the integrity of cables, and whether the environmental temperature is normal;

Cleaning and maintenance: Regularly clean the dust on the surface of the preamplifier to ensure good heat dissipation and avoid overheating faults caused by dust accumulation;

Spare parts management: Use original Bentley matching probes and extension cables. Non-original accessories are prone to cause measurement deviations or system failures.

IX. Usage precautions

Prohibit over-temperature operation: The working temperature should be controlled within the range of -40℃ to +85℃ to avoid aging due to high temperature or failure due to low temperature;

Avoid severe impact: The equipment is shock-resistant but cannot withstand severe impacts or long-term intense vibrations. The installation must be firmly fixed;

Prohibit use in explosion-proof areas: This model has no explosion-proof certification. It is strictly prohibited to use in flammable and explosive hazardous environments (such as oil and gas areas, chemical explosion-proof workshops);

Prohibit unauthorized modification: Do not privately change the cable length, replace non-original accessories or disassemble the equipment. Otherwise, it will lead to measurement failure, equipment damage, and loss of warranty eligibility;

Power-off operation: When connecting, repairing, or inspecting, the power must be cut off to prevent short circuits or electric shock accidents.